Most diffusable ion in excitable tissue is –
Correct Answer: K+
Description: Points to note
Concentration of ions
Na+ concentration higher in ECF
K+ concentration higher in ICF
Cl- concentration higher in ECF
K+ leak channels allow K+ to move from ICF to ECF
Na+ is prevented from entering the cell.
Thus diffusion is highest for K+, then Cl- and least for Na+, when the cell is at rest.
Category:
Physiology
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